xfs: refactor btree pointer checks

Refactor the btree pointer checks so that we can call them from the
scrub code without logging errors to dmesg.  Preserve the existing error
reporting for regular operations.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
3 files changed